使用Spring batch访问FooterCallBack中的ExecutionContext值

import org.springframework.batch.item.file.FlatFileFooterCallback;
import org.springframework.batch.item.file.FlatFileItemWriter;
import org.springframework.batch.item.file.transform.FooterCallback;
import org.springframework.batch.item.file.transform.WriterFooterCallback;
import org.springframework.batch.item.file.transform.WriterCallback;

public class CustomFooterCallback implements FlatFileFooterCallback {

    @Override
    public void writeFooter(Writer writer) throws IOException {
        if (writer instanceof FlatFileItemWriter) {
            FlatFileItemWriter itemWriter = (FlatFileItemWriter) writer;
            ExecutionContext executionContext = itemWriter.getExecutionContext();
            
            // 访问ExecutionContext中的值并进行处理
            String value = executionContext.getString("key");
            // 其他处理逻辑...
        }
    }
}